Cook Penne according to packet instructions. Drain, drizzle over olive oil and set aside.

Brown the beef mince and then sausage in a skillet over medium heat until cooked, slice sausages, then put in a large bowl. Add green pepper, onion, Kefalotiri cheese, oregano, garlic, mushrooms and olives. Add pasta and marinara sauce, toss well to combine.

Pour mixture into a greased Pyrex/ oven proof dish. Sprinkle 1 – 2 cups mozzarella cheese over the top. Bake in a preheated oven at 180°C for 15 to 20 minutes or until cheese is golden brown and bubbling.